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SDSI syntax

Simon raised the question of having negative assertions in SDSI.

I would like to note that SDSI does support strong negative assertions
for group membership; a server can indeed give a ``negative membership

SDSI has no other form of negative assertion, probably because the only
other real form of assertion in SDSI is a name/value binding, and it is
not clear what a negative name/value assertion's function would be.  

	[SDSI paper is a http://theory.lcs.mit.edu/sdsi.ps or .tex]